1922] Fauna from the. Eocene of Washington 17 



Occurrence. At locality 329 (University of Washington Palaeontological 

 Collection) west bank of the Cowlitz River, near Vader, Lewis County, Section 

 28, Township 11 North, Range 2 West. 



MODIOLUS KEXSOENSIS n. sp. 

 Plate X, Figure 13 



Description. Shell large, narrow and elongate in outline ; anterior end 

 straight and vertical ; ventral margin straight, rounding abruptly into the posterior 

 end which is broadly pointed ; the posterior dorsal margin is rounded obliquely 

 to the dorsal line ; beaks medium in size ; umbonal ridge pronounced, narrow 

 near the beaks, broadening posteriorly and occupying the whole width of the 

 last third of the shell ; the widening of the ridge gives the appearance of the fold 

 being overturned. The shell is concave directly beneath the ridge in the middle 

 portion of the shell and above, along the dorsal margin. The sculpture consists 

 of prominent, radiating ribs over the umbonal and dorsal regions but which 

 become obsolete on the middle area of the shell producing a smooth unstriated 

 area as in Modiolaria ; character of the ribs anteriorly unknown. 



This species differs from M. olequahensis n. sp. and M. cowlitzensis n. sp. 

 in the greater size and narrowness of outline. The angle of the umbonal ridge 

 is more nearly like that of M. olequahensis but the anterior end is straighter and 

 not produced, in that respect it is more like M. cowlitzensis. 



Dimensions. Length 50 mm.; greatest height 15 mm.; thickness 16 mm. 



Occurrence.- Type locality 347 (University of Washington Palaeontological 

 Collection) back of the Leybo place about one-half of a mile below old Inman- 

 Polson camp on Coal Creek, Cowlitz County, Section 27, Township 9 North, 

 Range 3 West ; at locality 370 ( University of Washington Palaeontological Col- 

 lection) Scattagrece Falls, Cowlitz County, Southeast quarter Section 18, Town- 

 ship 9 North, Range 2 West. 



MODIOL/US COLUMBIAN us n. sp. 

 Plate VIII, Figure 7 



Description. Shell large, oval-elongate in outline ; inequilateral, breaks situ- 

 low ; ventral margin straight ; dorsal margin sloping obliquely upward from the 

 beaks; posterior margin sloping at an angle of 45 from the dorsal line, rounding 

 shortly into the ventral margin ; umbonal ridge high, extending broadly to the 



